intg: Let python paths be configurable
It will allow to prefer locally built python modules
in integration tests.
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit a3bed9df5a47bfc84b82341f0f7e693e2b14a67a)